Optical fiber splice box with electromagnetic shielding function

Abstract

The present invention discloses a fiber optic splice closure with electromagnetic shielding function, comprising: a cap structure, a fiber optic disc structure, an end face structure, and a rear end cover structure; wherein: the cap structure is a multi-layer structure, a metal shielding layer embedded therein, a first absorbing plate embedded at the edge of the open end of the cap structure, and the first absorbing plate and the metal shielding layer are interconnected; the rear end cover structure is made of metal material, a third absorbing plate is disposed at the edge of the open end of the rear end cover structure; a second absorbing plate is disposed between the cap structure and the open ends of the rear end cover structure; one end of the fiber optic disc structure is connected to the inner side of the end face structure, and the cap structure, the end face structure, and the rear end cover structure are connected in sequence, and the first absorbing plate, the second absorbing plate, and the third absorbing plate are tightly connected to each other at their contact points, thereby achieving electromagnetic shielding of the fiber optic disc structure placed in the cap structure. The fiber optic splice closure of the present invention has good electromagnetic shielding effect and waterproof sealing performance.

Description

Technical Field

[0001] The present invention relates to the technical field of optical modules, and in particular to an optical fiber splice box with electromagnetic shielding function. Background Art

[0002] The primary function of a fiber optic splice closure is to split optical cables into individual fibers. Fiber optic splice closures are typically installed on walls, cables, utility poles, or sewers. They provide fiber-to-fiber splicing, fiber-to-pigtail splicing, and optical connector connections.

[0003] Fiber optic splice closures are primarily used for direct and branch connections of various optical cable structures, including those installed overhead, in ducts, and directly buried. The closures are generally constructed of synthetic plastic, characterized by high strength, corrosion resistance, and waterproofing. They are widely used in communications, network systems, CATV, and fiber optic network systems. Once the optical cable enters the closure, its outer sheath and reinforcing core are mechanically secured, ground wire protection components are installed, and end protection is performed. The optical fibers are then grouped and protected. The closure has the following functions: A fusion splicing function allows the optical fibers from the cable to be fusion-spliced with the pigtail cable, where the excess fibers are coiled and stored, and the splice is protected. A deployment function allows the connector attached to the pigtail cable to be plugged into an adapter, aligning the optical path with the optical connector on the other side of the adapter. A storage function allows the various cross-connected optical cables between racks to be neatly arranged.

[0004] Existing fiber optic splice closures have the following defects:

[0005] 1. It does not have electromagnetic shielding function or the electromagnetic shielding effect is poor. Fiber optic splice closures are often installed near high-voltage cables or high-power antennas, where the electromagnetic environment is complex. When optical modules or other active devices are installed in the fiber optic splice closures, the impact of electromagnetic interference on the active devices needs to be considered. However, most existing fiber optic splice closures do not have complete electromagnetic shielding function.

[0006] 2. The sealing performance of existing fiber optic splice closures is often suboptimal. Existing fiber optic splice closures, which only function as optical fiber storage, do not require very strict sealing rings. However, for fiber optic splice closures equipped with active devices, if rainwater or condensation enters the closure, it will damage the active devices inside the closure, so a more complete sealing structure is required.

[0007] Therefore, there is an urgent need to design an optical fiber splice closure with good electromagnetic shielding function and a complete sealing structure to adapt to the application scenario of the optical fiber splice closure for storing active devices. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide an optical fiber splice box with electromagnetic shielding function in view of the defects in the prior art.

[0009] The technical solution adopted by the present invention to solve its technical problem is:

[0010] The present invention provides an optical fiber splice box with electromagnetic shielding function, comprising: a box cap structure, an optical fiber disc structure, an end face structure and a rear end cover structure; wherein:

[0011] The box cap structure is a multi-layer structure with a metal shielding layer embedded inside. A first absorbing plate is embedded at the edge of the open end of the box cap structure, and the first absorbing plate and the metal shielding layer are connected to each other. The rear end cover structure is made of metal material, and a third absorbing plate is provided at the edge of the open end of the rear end cover structure. A second absorbing plate is provided between the open ends of the box cap structure and the rear end cover structure.

[0012] One end of the optical fiber disc structure is connected to the inner side of the end face structure, and the box cap structure, the end face structure, and the rear end cover structure are connected in sequence. The first absorbing plate, the second absorbing plate, and the third absorbing plate are tightly connected to each other at their contact positions, thereby realizing electromagnetic shielding of the optical fiber disc structure placed in the box cap structure.

[0013] Furthermore, a sealing ring is provided on both sides of the second absorbing plate of the present invention. The sealing ring on one side of the second absorbing plate contacts and seals with the first absorbing plate, and the sealing ring on the other side of the second absorbing plate contacts and seals with the third absorbing plate.

[0014] Furthermore, the second absorbing plate of the present invention is provided with V-shaped grooves on both upper and lower sides, the first absorbing plate is provided with a first V-shaped protrusion, and the third absorbing plate is provided with a second V-shaped protrusion. At the contact position between the first, second and third absorbing plates, the V-shaped groove on one side of the second absorbing plate engages with the first V-shaped protrusion on the first absorbing plate, and the V-shaped groove on the other side of the second absorbing plate engages with the second V-shaped protrusion on the third absorbing plate.

[0015] Furthermore, the first absorbing plate, the second absorbing plate and the third absorbing plate of the present invention are all ring-shaped.

[0016] Furthermore, the end face structure of the present invention includes an end face body, an optical cable entry assembly, a breakout card, a balance pressure plate, bolts, and a fixing bracket; wherein:

[0017] The fixing bracket is installed on one side of the end face body. Three cavities with the same shape as the optical cable entry component are opened on the end face body. A circle of limiting steps is set in the cavity. One side of the optical cable entry component passes through the cavity and is limited by the limiting steps and then connected to the fixing bracket. The other side of the optical cable entry component is fixed by a balancing pressure plate. The bolts pass through the balancing pressure plate, the optical cable entry component, the end face body and the fixing bracket in turn to connect and fix them; a fiber outlet hole is reserved in the optical cable entry component, and a plurality of branching cards are set, which are respectively set in the fiber outlet holes reserved in the optical cable entry component.

[0018] Furthermore, the optical cable entry assembly of the present invention comprises an inner gel assembly, an outer gel assembly, a metal flat washer and a metal screw; wherein:

[0019] The inner gel component and the outer gel component are both provided with a semicircular opening. After the inner gel component and the outer gel component are spliced together, the semicircular opening of the inner gel component and the semicircular opening of the outer gel component are spliced together to form a fiber outlet hole.

[0020] The balancing plate, inner gel assembly and outer gel assembly are all provided with corresponding screw holes. After the metal screw passes through the metal flat gasket, it passes through the screw holes on the balancing plate, inner gel assembly and outer gel assembly for fixed connection.

[0021] Furthermore, the optical cable entry assembly of the present invention further comprises a plug. If the fiber outlet hole is not in use, the plug is used to block the fiber outlet hole to seal the fiber outlet hole. If the fiber outlet hole is in use, a splitter card is placed in the fiber outlet hole.

[0022] Furthermore, the inner gel component and the outer gel component of the present invention are an integrally molded sandwich structure, the middle layer is a soft gel block, and the outer layers on both sides are plastic pressure plates; when the optical cable entry component is placed in the mold cavity, the soft gel block is squeezed by the pressure plates on both sides to cause deformation, thereby filling the gaps in the mold cavity and the gaps in the optical cable entry component.

[0023] Furthermore, the line breakout card of the present invention is in the shape of a cylinder with N grooves, 2≤N≤4, and the grooves are arranged in a centrosymmetrical manner with the center of the cylinder as the center.

[0024] Furthermore, the rear end cover structure of the present invention is provided with a plurality of end cover absorbing plates, and the arrangement positions of the end cover absorbing plates correspond one-to-one to the positions where the optical cables enter the components; and the inner wall of the rear end cover structure is also provided with irregularly shaped absorbing textures.

[0025] The beneficial effects produced by the present invention are:

[0026] 1. The present invention designs a good electromagnetic shielding structure for the optical fiber junction box: (1) A rear end cover structure is added to the rear of the end face structure, and the rear end cover structure of the end face structure is electromagnetically shielded by the metal shielding material; (2) A metal shielding layer is embedded in the box cap structure to electromagnetically shield the periphery of the box cap structure; (3) For the gap between the box cap structure and the end face structure, the gap is electromagnetically shielded by the cooperation of the first absorbing plate, the second absorbing plate, and the third absorbing plate; (4) The joints between the first absorbing plate, the second absorbing plate, and the third absorbing plate are electromagnetically shielded by the cooperation of V-shaped grooves and V-shaped protrusions; (5) In addition, the end cover absorbing plate is used at the head of the rear end cover structure, that is, the position where the optical cable is connected, to shield the gap again, and irregular shaped absorbing textures are used for electromagnetic shielding for the cavity inside the rear end cover structure.

[0027] 2. The present invention designs a more complete sealing structure for the optical fiber splice box: (1) Two sealing rings are provided at the joints between the first absorbing plate, the second absorbing plate, and the third absorbing plate, which can effectively seal the joints; (2) The end face structure adopts the structure of the inner gel component and the outer gel component, replacing the traditional hard structure; (3) Through the pressure plates on both sides of the gel component and the soft gel block on the inner side, the pressure plates squeeze the soft gel block to deform it, filling the gaps in the cavity and the gaps where the optical cable enters the component, thereby achieving complete sealing of all gaps. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0029] Figure 1 1 is a schematic diagram of the overall structure of an embodiment of the present invention;

[0030] Figure 2 1 is a structural diagram of an embodiment of the present invention;

[0031] Figure 3 is a cross-sectional view of an embodiment of the present invention;

[0032] Figure 4 is an exploded cross-sectional view of an embodiment of the present invention;

[0033] Figure 5 is the first absorbing plate of the embodiment of the present invention;

[0034] Figure 6 This is the third absorbing plate of the embodiment of the present invention;

[0035] Figure 7 is a top view of a second absorbing plate according to an embodiment of the present invention;

[0036] Figure 8 is the second absorbing plate of the embodiment of the present invention;

[0037] Figure 9 This is the end face structure of an embodiment of the present invention;

[0038] Figure 10 is an exploded view of an optical cable entry assembly according to an embodiment of the present invention;

[0039] Figure 11 is an installation diagram of an optical cable entry assembly according to an embodiment of the present invention;

[0040] Figure 12 is an assembly diagram of an optical cable entry assembly according to an embodiment of the present invention;

[0041] Figure 13 is the end surface body of the embodiment of the present invention;

[0042] Figure 14 This is an assembly diagram of the end face body of an embodiment of the present invention;

[0043] Figure 15 is a cross-sectional view of the end face of an embodiment of the present invention;

[0044] Figure 16 This is a line breakout card according to an embodiment of the present invention;

[0045] Figure 17 is a balancing pressure plate according to an embodiment of the present invention;

[0046] Figure 18 2. It is an installation diagram of the annular buckle according to an embodiment of the present invention. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0048] Example 1

[0049] like Figure 1 As shown, the optical fiber splice closure with electromagnetic shielding function according to the embodiment of the present invention comprises: a closure cap structure 1, an optical fiber tray structure 2, an end face structure 3 and a rear end cover structure 4.

[0050] The shape of the cap structure 1 is not limited. In this embodiment, the cap structure 1 is cylindrical. In other embodiments, a rectangular parallelepiped or other irregular shapes may be used. The cap structure 1 protects the optical module, active components, optical devices, optical fiber cables, etc. within the cap, and securely connects the cap structure 1 to the end face structure 3.

[0051] The fiber optic tray structure 2 is mounted within the box cap structure 1, with its end fixedly connected to the end face structure 3. The tray structure 2 can be used to mount multiple layers of fiber optic trays, as well as optical modules or other active components. These components can be powered by batteries or a single power cord via an optical cable. Both spliced and unspliced optical fibers are stored on the tray structure 2.

[0052] The shape of the end face structure 3 is not limited; its shape and structure correspond to the portion connected to the closure cap structure 1. The end face structure 3 is used for the entry of optical fibers and the output of optical fibers after fiber splitting within the optical fiber splice closure, making the optical fiber splice closure a sealed whole and meeting the requirements of the optical fiber splice closure for its use environment.

[0053] The shape of the rear end cap structure 4 is not limited; its shape and structure correspond to the portion where the box cap structure 1 and the end face structure 3 are connected. The rear end cap structure 4 is located on one side of the end face structure 3 and is made of metal. The input optical cable first passes through the rear end cap structure 4 and then passes through the end face structure 3 for fiber splitting.

[0054] like Figure 2 As shown, in a preferred embodiment of the present invention, the outer layer of the box cap structure 1 is provided with a shock-resistant and reinforcing texture. In this embodiment, a plastic material texture is used that is staggered horizontally and vertically, which can play a role in structural reinforcement. In the event of accidental drop, the outer layer texture of the box cap structure 1 can also play a certain shock-resistant role.

[0055] Example 2

[0056] like Figure 3 As shown, the embodiment of the present invention mainly describes the electromagnetic shielding structure design of the present invention, and the main absorbing structure includes:

[0057] The first absorbing plate 1-1 is embedded in the edge of the open end of the cap structure 1. Its shape and structure correspond to the portion where the cap structure 1 and the end surface structure 3 meet. In this embodiment of the present invention, the cap structure 1 is a multi-layered structure, embedded within a metal shielding layer 1-2. The metal shielding layer is constructed of plastic both inside and outside, with the metal shielding layer 1-2 embedded within the plastic layer. The first absorbing plate 1-1 and the metal shielding layer 1-2 are interconnected at the open end of the cap structure 1, forming a complete electromagnetic shielding structure.

[0058] The shape and structure of the second absorbing plate 5 correspond to the portion connected to the box cap structure 1 and the end surface structure 3 , and are both annular. In the embodiment of the present invention, a circular ring is used. In other preferred embodiments, a square ring or a rectangular ring may also be used.

[0059] The third absorbing plate 4 - 1 is arranged at the edge of the open end of the rear cover structure 4 , and its shape and structure correspond to the portion where the box cap structure 1 and the end surface structure 3 are connected.

[0060] like Figure 4 As shown, in a preferred embodiment of the present invention, in order to achieve waterproof sealing of the gaps at the connections between the first absorbing plate 1-1, the second absorbing plate 5, and the third absorbing plate 4-1, a sealing ring 6 is provided on both sides of the second absorbing plate 5. The sealing ring 6 on one side of the second absorbing plate 5 contacts and seals with the first absorbing plate 1-1, and the sealing ring 6 on the other side of the second absorbing plate 5 contacts and seals with the third absorbing plate 4-1.

[0061] The first absorbing plate 1-1, the second absorbing plate 5, and the third absorbing plate 4-1, the metal rear cover structure 4, and the metal shielding layer 1-2 connected to the first absorbing plate 1-1 provide electromagnetic shielding for the active components within the cap structure 1. The sealing ring 6 provided at the gaps seals the connection gaps.

[0062] Example 3

[0063] In order to further improve the electromagnetic shielding effect of the embodiment of the present invention, the embodiment of the present invention adopts a V-shaped structure to process the gap. Specifically:

[0064] like Figure 5 As shown, the first absorbing plate 1-1 is provided with a first V-shaped protrusion 1-3. A plurality of first V-shaped protrusions 1-3 may be provided. In the embodiment of the present invention, two first V-shaped protrusions 1-3 are provided.

[0065] like Figure 6 As shown, the third absorbing plate 4 - 1 is provided with a second V-shaped protrusion 4 - 2 . A plurality of second V-shaped protrusions 4 - 2 may be provided. In the embodiment of the present invention, two second V-shaped protrusions 4 - 2 are provided.

[0066] like Figure 7 and Figure 8 As shown, V-shaped grooves 5-1 are provided on both upper and lower surfaces of the second absorbing plate 5. A plurality of V-shaped grooves 5-1 can be provided, and the number of V-shaped grooves 5-1 on both sides is equal to the number of corresponding first V-shaped protrusions 1-3 and second V-shaped protrusions 4-2. In the embodiment of the present invention, two V-shaped grooves 5-1 are provided on both sides.

[0067] At the contact point between the first absorbing plate 1-1, the second absorbing plate 5, and the third absorbing plate 4-1, a V-shaped groove 5-1 on one side of the second absorbing plate 5 engages with a first V-shaped protrusion 1-3 on the first absorbing plate 1-1. Meanwhile, a V-shaped groove 5-1 on the other side of the second absorbing plate 5 engages with a second V-shaped protrusion 4-2 on the third absorbing plate 4-1. The V-shaped electromagnetic shielding structure of this embodiment further enhances the electromagnetic shielding effect at the connection gap.

[0068] Example 4

[0069] like Figure 9 As shown, the end face structure 3 of the embodiment of the present invention mainly includes the following structures: an end face body 3-1, an optical cable entry assembly 3-2, a breakout card 3-3, a balance pressure plate 3-4, a bolt 3-5 and a fixing bracket 3-6; wherein:

[0070] The end face body 3-1 is made of plastic. The end face body 3-1 and the box cap structure 1 are assembled. The other parts of the end face structure 3 are based on the end face body 3-1 and are fixed to the end face body 3-1 by bolts 3-5. Finally, the end face structure 3 forms a closed plane. After the end face structure 3 is assembled to the box cap structure 1, the optical fiber splice box forms a sealed whole, meeting the industry's requirements for the use environment of the optical fiber splice box.

[0071] Three optical cable entry assemblies 3-2 are provided, arranged symmetrically around the center. In another preferred embodiment of the present invention, the end face body 3-1 is provided with three cavities shaped identically to the optical cable entry assemblies 3-2. Each cavity is provided with a circle of limiting steps. One side of the optical cable entry assembly 3-2 passes through the cavity, is limited by the limiting steps, and then connects to the fixing bracket 3-6.

[0072] There are multiple branching cards 3-3, which are respectively arranged in the fiber outlet holes 3-2-6 reserved in the optical cable entry component 3-2.

[0073] The balance pressure plate 3-4 is used to fix the other side of the optical cable entering the component 3-2. It is used to balance the component. The embodiment of the present invention needs to rely on the deformation of the gel material itself to fill the gap and meet the industry requirements. The deformation will cause some places to be filled with more material and some places to have gaps due to uneven force. Figure 17 The balancing pressure block shown can spread the force to all points where the optical cable enters the assembly 3 - 2 , so that the force is evenly distributed and the sealing effect is obvious.

[0074] Bolt 3-5 is used for serial fixation of the entire end face structure 3. There is a rivet nut on the fixing bracket 3-6. Through the bolt 3-5 and the bolt-nut structure of the fixing bracket 3-6, the end face body 3-1, the optical cable entry component 3-2, and the balance pressure plate 3-4 are connected in series.

[0075] The fixing bracket 3-6 is a fixing structure for the optical cable entry assembly 3-2, and is also a structure for installing the entry optical cable reinforcement and the optical cable.

[0076] Example 5

[0077] like Figure 10As shown, in order to further improve the sealing performance of the optical cable entry assembly 3-2, the optical cable entry assembly 3-2 includes an inner gel assembly 3-2-1, an outer gel assembly 3-2-2, a metal flat gasket 3-2-4 and a metal screw 3-2-5; wherein:

[0078] The inner gel component 3-2-1 and the outer gel component 3-2-2 are both provided with semicircular openings. After the inner gel component 3-2-1 and the outer gel component 3-2-2 are spliced together, the semicircular opening of the inner gel component 3-2-1 and the semicircular opening of the outer gel component 3-2-2 are spliced to form the fiber outlet hole 3-2-6; Figure 11 shown.

[0079] The balancing plate 3-4, the inner gel component 3-2-1 and the outer gel component 3-2-2 are all provided with corresponding screw holes. The metal screw 3-2-5 passes through the metal flat gasket 3-2-4 and then passes through the screw holes on the balancing plate 3-4, the inner gel component 3-2-1 and the outer gel component 3-2-2 to be fixedly connected. Figure 12 shown.

[0080] The inner gel component 3-2-1 and the outer gel component 3-2-2 are an integrally molded sandwich structure, the middle layer is a soft gel block, and the outer layers on both sides are plastic pressure plates; when the optical cable entry component 3-2 is placed in the cavity, the soft gel block is squeezed by the pressure plates on both sides to deform, filling the gaps in the cavity and the gaps in the optical cable entry component 3-2.

[0081] like Figure 13 and Figure 14 As shown, by combining the deformable material and the hard material, the sealing performance of the optical cable entry component 3-2 is further improved, thereby forming a sealed environment to meet the industry requirements for optical fiber splice closures (IP68).

[0082] Example 6

[0083] The embodiment of the present invention provides a structure and method for alternately using the line breakout card 3-3 and the plug 3-2-5. Specifically:

[0084] like Figure 15 As shown, if the fiber outlet hole 3-2-6 is not in use, the plug 3-2-5 is used to block the fiber outlet hole 3-2-6, making the fiber outlet hole 3-2-6 sealed. If the fiber outlet hole 3-2-6 is in use, the branching card 3-3 is placed inside the fiber outlet hole 3-2-6. The structure of alternating use of the branching card 3-3 and the plug 3-2-5 ensures the sealing performance of the structure.

[0085] In a preferred embodiment of the present invention, Figure 16As shown, the breakout card 3-3 is installed in the fiber outlet hole 3-2-6 reserved in the optical cable entry component 3-2, which will cut the large hole (fiber outlet hole 3-2-6) into four equally divided small holes. The four small holes can accommodate up to 4 optical fibers. The breakout card 3-3 has various forms, corresponding to cutting the hole into 2 / 3 / 4 holes, corresponding to the use of different numbers of optical fibers.

[0086] Example 7

[0087] like Figure 9 As shown, a plurality of end cover absorbing plates 7 are provided on the rear end cover structure 4, and the setting positions of the end cover absorbing plates 7 correspond one to one with the positions where the optical cable enters the component 3-2; and an irregular shaped absorbing texture is also provided on the inner wall of the rear end cover structure 4.

[0088] like Figure 18 As shown, in a preferred embodiment of the present invention, the outer edge of the connection between the box cap structure 1, the end face structure 3, and the rear end cover structure 4 is fixed at the outer edge of the three by a metal ring buckle 8. In addition to having a fixing effect, this fixing method can also provide a certain degree of electromagnetic shielding for the gaps between the three.

[0089] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. An optical fiber splice closure with electromagnetic shielding function, characterized in that: include: A box cap structure (1), an optical fiber disc structure (2), an end face structure (3) and a rear end cover structure (4); wherein: The box cap structure (1) is a multi-layer structure, a metal shielding layer (1-2) is embedded in the box cap structure (1), a first absorbing plate (1-1) is embedded at the edge of the opening end of the box cap structure (1), and the first absorbing plate (1-1) and the metal shielding layer (1-2) are connected to each other; the rear end cover structure (4) is made of metal material, a third absorbing plate (4-1) is provided at the edge of the opening end of the rear end cover structure (4); a second absorbing plate (5) is provided between the opening ends of the box cap structure (1) and the rear end cover structure (4); One end of the optical fiber disc structure (2) is connected to the inner side of the end face structure (3); the box cap structure (1), the end face structure (3), and the rear end cover structure (4) are connected in sequence; the first absorbing plate (1-1), the second absorbing plate (5), and the third absorbing plate (4-1) are tightly connected to each other at their contact positions, thereby achieving electromagnetic shielding of the optical fiber disc structure (2) placed in the box cap structure (1).

2. The optical fiber splice closure with electromagnetic shielding function according to claim 1, characterized in that: A sealing ring (6) is provided on both sides of the second absorbing plate (5), the sealing ring (6) on one side of the second absorbing plate (5) contacts and seals with the first absorbing plate (1-1), and the sealing ring (6) on the other side of the second absorbing plate (5) contacts and seals with the third absorbing plate (4-1).

3. The optical fiber splice closure with electromagnetic shielding function according to claim 1, characterized in that: The second absorbing plate (5) is provided with a V-shaped groove (5-1) on both upper and lower side surfaces, the first absorbing plate (1-1) is provided with a first V-shaped protrusion (1-3), and the third absorbing plate (4-1) is provided with a second V-shaped protrusion (4-2). At the contact position between the first absorbing plate (1-1), the second absorbing plate (5) and the third absorbing plate (4-1), the V-shaped groove (5-1) on one side of the second absorbing plate (5) and the first V-shaped protrusion (1-3) on the first absorbing plate (1-1) engage with each other, and the V-shaped groove (5-1) on the other side of the second absorbing plate (5) and the second V-shaped protrusion (4-2) on the third absorbing plate (4-1) engage with each other.

4. The optical fiber splice closure with electromagnetic shielding function according to claim 1, characterized in that: The first wave absorbing plate (1-1), the second wave absorbing plate (5) and the third wave absorbing plate (4-1) are all annular.

5. The optical fiber splice closure with electromagnetic shielding function according to claim 1, characterized in that: The end face structure (3) comprises an end face body (3-1), an optical cable entry assembly (3-2), a branching card (3-3), a balance pressure plate (3-4), bolts (3-5) and a fixing bracket (3-6); wherein: The fixing bracket (3-6) is installed on one side of the end face body (3-1). Three cavities with the same shape as the optical cable entry component (3-2) are opened on the end face body (3-1). A circle of limiting steps is arranged in the cavity. One side of the optical cable entry component (3-2) passes through the cavity and is limited by the limiting steps before being connected to the fixing bracket (3-6). The other side of the optical cable entry component (3-2) is fixed by a balance pressure plate (3-4). Bolts (3-5) pass through the balance pressure plate (3-4), the optical cable entry component (3-2), the end face body (3-1) and the fixing bracket (3-6) in sequence for connection and fixing. A fiber outlet hole (3-2-6) is reserved in the optical cable entry component (3-2). A plurality of branching cards (3-3) are provided, which are respectively arranged in the fiber outlet holes (3-2-6) reserved in the optical cable entry component (3-2).

6. The optical fiber splice closure with electromagnetic shielding function according to claim 5, characterized in that: The optical cable entry assembly (3-2) includes an inner gel assembly (3-2-1), an outer gel assembly (3-2-2), a metal flat gasket (3-2-4) and a metal screw (3-2-5); wherein: The inner gel component (3-2-1) and the outer gel component (3-2-2) are both provided with semicircular openings. After the inner gel component (3-2-1) and the outer gel component (3-2-2) are spliced together, the semicircular opening of the inner gel component (3-2-1) and the semicircular opening of the outer gel component (3-2-2) are spliced together to form a fiber outlet hole (3-2-6); The balancing pressure plate (3-4), the inner gel component (3-2-1) and the outer gel component (3-2-2) are all provided with screw holes at corresponding positions. The metal screw (3-2-5) passes through the metal flat gasket (3-2-4) and then passes through the screw holes on the balancing pressure plate (3-4), the inner gel component (3-2-1) and the outer gel component (3-2-2) to be fixedly connected.

7. The optical fiber splice closure with electromagnetic shielding function according to claim 6, characterized in that: The optical cable entry assembly (3-2) also includes a plug (3-2-3). If the fiber outlet hole is not used, the plug (3-2-3) blocks the fiber outlet hole (3-2-6) to seal the fiber outlet hole (3-2-6). If the fiber outlet hole (3-2-6) is used, the branching card (3-3) is placed in the fiber outlet hole (3-2-6).

8. The optical fiber splice closure with electromagnetic shielding function according to claim 6, characterized in that: The inner gel component (3-2-1) and the outer gel component (3-2-2) are an integrally molded sandwich structure, the middle layer is a soft gel block, and the outer layers on both sides are plastic pressure plates; when the optical cable entry component (3-2) is placed in the cavity, the soft gel block is squeezed by the pressure plates on both sides to deform, filling the gaps in the cavity and the gaps in the optical cable entry component (3-2).

9. The optical fiber splice closure with electromagnetic shielding function according to claim 5, characterized in that: The line distribution card (3-3) is in the shape of a cylinder with N grooves, 2≤N≤4, and the grooves are arranged in a central symmetrical manner with the center of the cylinder as the center.

10. The optical fiber splice closure with electromagnetic shielding function according to claim 5, characterized in that: A plurality of end cover absorbing plates (7) are provided on the rear end cover structure (4), and the arrangement positions of the end cover absorbing plates (7) correspond one-to-one to the positions where the optical cables enter the assembly (3-2); and an irregularly shaped absorbing texture is also provided on the inner wall of the rear end cover structure (4).

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